.page-about {
  --about-card: #12302A;
  --about-hair: rgba(30, 61, 51, .9);
  --about-label: rgba(126, 154, 144, .9);
  padding-bottom: clamp(40px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 4vw, 36px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

.page-about .about-hero__title {
  font-family: var(--font-condensed);
  font-size: clamp(30px, 8vw, 56px);
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--white);
  margin: 14px 0 0;
  max-width: 24ch;
}

.page-about .about-hero__intro {
  margin: 18px 0 0;
  max-width: 60ch;
  color: var(--white);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__panel {
  border: var(--line);
  border-top: 2px solid var(--signal);
  background:
    linear-gradient(180deg, var(--signal-06), transparent 62%),
    var(--panel);
  padding: 18px;
}

.page-about .about-hero__panel-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
}

.page-about .about-facts__item {
  display: grid;
  gap: 4px;
  padding-left: 10px;
  border-left: 1px solid var(--signal-18);
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--signal);
}

.page-about .about-facts__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-toc {
  margin-top: clamp(26px, 5vw, 44px);
  border-top: var(--line);
  border-bottom: var(--line);
  background: linear-gradient(90deg, var(--signal-06), transparent 70%);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__item {
  flex: 0 0 auto;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 12px 16px;
  border-right: var(--line);
  color: var(--muted);
  font-size: 13.5px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-toc__link span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--signal);
  letter-spacing: .1em;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--white);
  background: var(--signal-06);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-block {
  padding-top: clamp(52px, 9vw, 88px);
}

.page-about .chapter__index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--signal);
  border: 1px solid var(--signal-18);
  background: var(--signal-06);
  padding: 4px 10px;
  transition: background-color .25s var(--ease), border-color .25s var(--ease), color .25s var(--ease);
}

.page-about [data-chapter].is-active .chapter__index {
  color: var(--ink);
  background: var(--signal);
  border-color: var(--signal);
}

.page-about .chapter__head {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.page-about .chapter__title {
  font-family: var(--font-condensed);
  font-size: clamp(24px, 5.6vw, 40px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 0;
  max-width: 26ch;
}

.page-about .chapter__lede {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .chapter__body {
  margin-top: clamp(22px, 4vw, 32px);
}

/* ---------- 01 三问 ---------- */
.page-about .about-trios {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: var(--line);
}

.page-about .about-trio {
  background: var(--ink);
  padding: 22px 20px 24px;
}

.page-about .about-trio__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--amber);
}

.page-about .about-trio__title {
  margin: 12px 0 0;
  font-size: 17.5px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.45;
}

.page-about .about-trio__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 02 时间带 ---------- */
.page-about .about-rail {
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 14px;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__track {
  position: relative;
  min-width: 860px;
  padding-top: 10px;
}

.page-about .about-rail__line {
  display: block;
  width: 100%;
  height: 2px;
  stroke: var(--signal);
  stroke-width: 1;
  opacity: .55;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.page-about .about-rail__node {
  position: relative;
  border: var(--line);
  background: var(--panel);
  padding: 26px 16px 20px;
}

.page-about .about-rail__node::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 16px;
  width: 10px;
  height: 10px;
  background: var(--signal);
  box-shadow: 0 0 0 4px var(--signal-12);
}

.page-about .about-rail__tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--signal);
}

.page-about .about-rail__title {
  margin: 10px 0 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-rail__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 03 教练履历库 ---------- */
.page-about .about-dossier {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-dossier__index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-dossier__btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--grid);
  padding: 9px 12px;
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-dossier__btn:hover {
  color: var(--white);
  border-color: var(--signal-35);
}

.page-about .about-dossier__btn.is-active,
.page-about .about-dossier__btn[aria-pressed="true"] {
  color: var(--ink);
  background: var(--signal);
  border-color: var(--signal);
}

.page-about .about-dossier__stage {
  display: grid;
  gap: 18px;
}

.page-about .about-dossier__scroller {
  list-style: none;
  margin: 0;
  padding: 10px 2px 18px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(250px, 82%);
  gap: 16px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
}

.page-about .about-club {
  scroll-snap-align: start;
  position: relative;
  border: var(--line);
  border-top: 2px solid var(--amber);
  background: linear-gradient(180deg, var(--amber-18), transparent 42%), var(--panel);
  box-shadow: 5px 5px 0 0 var(--about-hair);
  padding: 18px 16px 20px;
  transition: border-color .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .about-club:hover,
.page-about .about-club:focus-within {
  border-color: var(--signal-35);
  box-shadow: 5px 5px 0 0 var(--signal-18);
}

.page-about .about-club__name {
  margin: 12px 0 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-club__brief {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color .22s var(--ease);
}

.page-about .about-club:hover .about-club__brief,
.page-about .about-club:focus-within .about-club__brief {
  -webkit-line-clamp: unset;
  overflow: visible;
  color: var(--white);
}

.page-about .about-club__meta {
  margin: 14px 0 0;
}

.page-about .about-club__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  padding-top: 8px;
  margin-top: 8px;
  border-top: 1px dashed var(--grid);
}

.page-about .about-club__row dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--about-label);
}

.page-about .about-club__row dd {
  margin: 0;
  font-size: 13px;
  color: var(--white);
  text-align: right;
}

/* ---------- 图片容器 ---------- */
.page-about .about-media {
  margin: 0;
  border: var(--line);
  background: var(--ink);
  overflow: hidden;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-media .media__caption {
  padding: 10px 14px;
  border-top: var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 04 数据来源 ---------- */
.page-about .about-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: var(--line);
}

.page-about .about-step {
  background: var(--panel);
  padding: 20px 18px 22px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-step__k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about .about-step__t {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-step__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-metrics {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: var(--line);
}

.page-about .about-metric {
  background: var(--ink);
  padding: 16px 14px;
  display: grid;
  gap: 6px;
}

.page-about .about-metric__v {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--amber-soft);
  letter-spacing: -.01em;
}

.page-about .about-metric__k {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-map {
  margin-top: 24px;
}

/* ---------- 05 团队 ---------- */
.page-about .about-teams-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .about-teams {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-team {
  position: relative;
  border: var(--line);
  border-left: 2px solid var(--signal-18);
  background: var(--about-card);
  padding: 18px 16px 20px;
  transition: border-left-color .22s var(--ease);
}

.page-about .about-team:hover {
  border-left-color: var(--signal);
}

.page-about .about-team__k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--signal);
}

.page-about .about-team__t {
  margin: 10px 0 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-team__d {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-teams__figure {
  margin: 0;
}

/* ---------- 06 合作 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-partner {
  border: var(--line);
  background: linear-gradient(160deg, var(--signal-06), transparent 55%), var(--panel);
  padding: 20px 18px 22px;
}

.page-about .about-partner__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--signal);
}

.page-about .about-partner__t {
  margin: 8px 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-partner__d {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-coop {
  margin-top: 22px;
  border: var(--line);
  border-left: 2px solid var(--amber);
  background: var(--ink);
  padding: 20px 18px 22px;
}

.page-about .about-coop__text {
  margin: 0;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--white);
}

.page-about .about-coop__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

/* ---------- 07 价值与行动 ---------- */
.page-about .about-values {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: var(--line);
}

.page-about .about-value {
  background: var(--panel);
  padding: 20px 18px 22px;
}

.page-about .about-value__t {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-value__d {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-cta {
  margin-top: 24px;
  border: var(--line);
  border-top: 2px solid var(--signal);
  background:
    linear-gradient(180deg, var(--signal-06), transparent 70%),
    var(--about-card);
  padding: 22px 18px 24px;
  display: grid;
  gap: 18px;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-condensed);
  font-size: clamp(20px, 4.6vw, 28px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-cta__desc {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-trios {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-teams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-values {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-dossier__scroller {
    grid-auto-columns: minmax(270px, 46%);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
    padding: 26px 24px 28px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
    gap: 44px;
    align-items: center;
  }

  .page-about .about-hero__panel {
    padding: 22px 20px;
  }

  .page-about .about-rail__track {
    min-width: 100%;
  }

  .page-about .about-dossier {
    grid-template-columns: minmax(180px, 220px) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .about-dossier__index {
    position: sticky;
    top: 84px;
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 6px;
  }

  .page-about .about-dossier__btn {
    text-align: left;
    padding: 10px 14px;
  }

  .page-about .about-teams-wrap {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-dossier__btn,
  .page-about .about-club,
  .page-about .about-club__brief,
  .page-about .about-team,
  .page-about .chapter__index {
    transition: none;
  }

  .page-about .about-rail,
  .page-about .about-dossier__scroller,
  .page-about .about-toc__list {
    scroll-behavior: auto;
  }
}